The River Aller is a small river on Exmoor in Somerset. It rises as several small streams around Tivington and Huntscott and flows through the Holnicote Estate passing Holnicote and through Allerford, where it passes under a packhorse bridge of medieval origin. It then joins the River Horner, which flows into Porlock Bay near Hurlstone Point on the Bristol Channel. Because of the surrounding geology the area has been at risk of flooding. To help manage this risk telemetry monitoring of flows and a siren warning system have been proposed.This camera was installed and is maintained by the Environment Agency and can be viewed here
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Allerford is a village in the county of Somerset, England, located within Exmoor National Park, and is part of the parish of Selworthy in the district of Somerset West and Taunton. It appears in Domesday Book as 'Alresford – forda Ralph de Limesy Mill'. The parish was part of the hundred of Carhampton. One of the village's main attractions is the much-photographed packhorse bridge. Built as a crossing over the River Aller (from which the village gets its name), it is thought to be medieval in origin. Nearby is the New Bridge where the A39 road crosses Horner Water. The 18 feet wide pointed arch rises 8 feet with a 4 feet span half arch on the side for flood relief. Originally the bridge was 12 feet wide but another 6 feet was added in 1866. The packhorse bridge is an Ancient monument and has been added to the Heritage at Risk Register. Allerford New Bridge which carries the A39 road past the village is also a Scheduled Ancient Monument and Grade II* listed building. It is also on the Heritage at Risk register because of the risks of vehicle damage and erosion.